<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
       let arr = []
       let sum =0
    
       for(let i = 1; i<=5; i++){
        let num = +prompt(`请输入第${i}个数`)
        arr.push(num)
       }
       for(let i=0; i<arr.length; i++){
        if(arr[i] >= 18){
          console.log(arr[i])
        }
       }
       for(let i=0; i<arr.length; i++){
         sum += arr[i]
         
       }
       console.log(sum)
       console.log(sum / arr.length)
       let max = arr[0]
       for(let i=0; i<arr.length; i++){
        if (max < arr[i]) max = arr[i]
       }
       console.log(max)
       let min = arr[0]
       for(let i=0; i<arr.length; i++){
        if (min > arr[i]) min = arr[i]
       }
       console.log(min)
    </script>
</body>
</html>